<html>
<head>
    <title>size change page</title>
    <script lang="javascript">
        function removeRow() {
            document.getElementsByClassName("row")[0].remove();
        }

        function makeRowNotDisplayed() {
            document.getElementsByClassName("row")[0].style.display = "none";
        }

        function makeRowDisabled() {
            document.getElementsByClassName("row")[0].setAttribute("disabled", "");
        }

        function setVolvoSelected() {
            document.getElementById("mySelect").value = 'volvo';
        }

    </script>
</head>
<body>
<script lang="javascript">
    window.setTimeout(removeRow, 1000);
</script>

<div class="container2">
    <div class="row">row</div>

    <select id="mySelect">
        <option value="volvo">Volvo</option>
        <option value="saab" selected>Saab</option>
    </select>
</div>
</body>
</html>